Kerala

I am sure there are major communication issues.

What did the lawyer mail to the embassy? Nothing should be mailed to them, you’re still at the NVC stage. Hopefully this is just your aunt misunderstanding the process though rather than your lawyer sending things to the wrong place. 
 
Study this page so you can understand what’s going on and what needs to be done. https://travel.state.gov/content/travel/en/us-visas/immigrate/the-immigrant-visa-process/step-1-submit-a-petition/step-2-begin-nvc-processing.html

Your screen name Kerala is a State in India. Your country is stated as Grenada! Just curious! Did your mom apply for tourist visa from Grenada or India?

They rightly assume she will use it to try to immigrate.   She needs to be properly petitioned for an immigrant visa.

Yeah I thought so too...thank you guys!

Usually it is failure to show non immigrant intent
 
She would have been told.

Parents sometimes plan to come to the US as a visitor with the intent to stay illegally.  Siblings, not so much.  Consulate Officers know that...... Just one thought.

This is really odd, if you had your Welcome Letter over 3 years ago why has the DS-260 not been done since then? I'd ask your lawyer exactly what is going on. Have you paid the fees? Uploaded supporting documents? Once you've done those things and the DS-260 then you should be Documentary Qualified fairly quickly and then just in the queue for an interview at the consulate, but it seems like a lot of time has been wasted for no reason. 

His father is F1 and priority date was not current until very recently.

So start filling it out and come back here for guidance 

1) good news - you know you cannot age out.
 
2) what screen do you see? This?
 
https://travel.state.gov/content/dam/visas/DS-260-Exemplar.pdf
 
page 5
 

Yeah I know 

Hello all, 
 
I've gotten great help from everyone here, so I want to share my interview experience, in hope that it helps somewhat to those of you waiting. 
 
Location: Skopje, Macedonia
We picked up our medical results at 7AM from the hospital, and went to the embassy at 8AM for our interview. We were the first in the list to be called, so we walked in to an empty embassy interview hall. A nice guy helped us arrange all of our documents, and soon after 10 minutes, we got called to hand out the prepared documents. The guy took our fingerprints, and asked us if we have any valid visas. At this point I also saw that he has a CSPA worksheet for me, which had all the details of when the case was sent and approved, along with the last row, saying "QUALIFIES". 
After being done here, we were seated again, and waited for the interview with the consul. We got called 10 minutes after, we approached the window, and we were asked to raise our right hand, and swear to tell the truth. 
Then my mom was asked only 3 questions:
1. Who's applying for your immigration petition?
2. Where does he live?
3. What does he do? 
 
And the last question was for all of us (me, my mom and dad):
4. Have you ever committed any crime? 
 
After this, he said, thank you, your visas have been approved and we will call you within the next two weeks to pick them up. Have a good life in the US. 
 
No one at any time mentioned anything about my age (i'm currently 24, about to be 25. But my CSPA age is 19). The only thing that i glimpsed was the CSPA Worksheet. 

Everyone at the embassy was really warm and really made you feel like there were there to help you and not cause issues. 
 
Overall, the best possible experience we could have hoped for. 
 
 
Let me know if you have any questions. 
 
 
Thanks!

No it's okay 🤣 you were trying to help and I appreciate that thank you!

So sorry for giving you a heart attack!  Please ignore everything I said -- I mis-read your post and obviously had you under the wrong visa category!

Ok, that definitely changes things, so he’s F1. Well as it turns out F1 too has been stuck at the same date for at least the past year, however there’s only two weeks movement needed for you to get current if it’s F1 and one has to assume that will happen sometime in the next 5 years at least! So you should be ok. 

Is your dad not married? I think both jan22 and I assumed he was. 

While there is no way to say for certain whether you will remain eligible when your priority date (14 Dec 2014) becomes current -- and I don't want to say it's impossible -- realistically it is unlikely that your priority date will be current with the next 5 1/2 years, so you probably will age out and not be eligible with your family. 
 
The current priority date is only at 15 Dec 2007 -- seven years before yours.  It would have to advance more than a year almost every year for it to be current before you age out -- that is highly unlikely to happen.  It rarely advances more than a year, if that.  Taking a look at where the priority date was in November of the past 12 years:
Nov 2010:    1 Jan 2002 Nov 2011:  15 Jun 2000  --  regressed approx. 18 months Nov 2012:   22 Mar 2001 -- advanced approx. 9 months Nov 2013:   22 Aug 2001 -- advanced approx. 5 months Nov 2014:     8 Feb 2002 --  advanced approx. 6 months Nov 2015:     1 Mar 2003 -- advanced approx. 13 months Nov 2016:     1 Dec 2003 -- advanced approx. 9 months Nov 2017:  22 May 2004 -- advanced approx. 5 months Nov 2018:     1 Jun 2005 -- advanced approx. 13 months Nov 2019:     1 Jan 2007 -- advanced approx. 18 months Nov 2020:   22 Sep 2006 -- regressed approx. 4 months Nov 2021:   22 Mar 2007 -- advanced approx. 6 months Nov 2022:   15 Dec 2007 -- advanced approx. 9 months. This shows an average advancement of priority date of about 6 months per year.  The past 5 years averaged about an 8 1/2 month advancement of tbe priority date per year.  Given the numerical limits of the category and the increasing number of petitions filed each year, it is unlikely the average priority date advancement (6-9 montbs a year) will increase much in the next 5 or 6 years.  If it does, it still likely won't advance as much as you need it to.  I'm not saying this to be discouraging, rude or mean -- I'm just trying to show you the possibilities so you can make life choices and decisions based on the most complete information available.
 
 
 
 

@jan22 great analysis, except that you must have looked at table B in the latest VB because it is in fact still stuck at 22 March 2007 where it’s been all year. So there has literally been zero advancement. This is because of all the covid issues, first the embassies closing, then the trump ban on various categories including this one, then the priority given to other categories when embassies reopened, all contributing to massive backlogs in especially F3 and F4. Although the priority tier ranking is no longer in place, there is clearly still such a backlog - and with many embassies are still not operating at full capacity (they are getting a total of about half the immigrant visas done per month at present than pre-covid) - that they are not yet able to move PDs forward because they’re still clearing the existing queue.

No one can say with any certainty when your petition will be current. You have about 5 years 5 months (depending on your exact birthday) of protection under CSPA. This means that the petition will need to be current before you turn 26 years 5 months (again exact birthday will make this more exact) for you to be protected under CSPA.